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Quick Answer. It takes 9 to 10 hours to cook a 3-pound beef top round roast in a Crock-Pot at the low setting. The roast only requires about 5 hours of cooking time at the high setting, but this tough cut of meat isn't recommended for cooking on the high setting. The faster cook time and higher temperature doesn't break down the tough meat fibers and leaves the roast tough.
For a 3 pound roast cook for the time of a 2 pounder. Beef Top Sirloin Roast Stove Top or 450F in oven 325F 18-22 125F With a higher amount of fat, this cut is more flavourful and tender than the Sirloin Tip. This roast is best served med. rare.amb Saddle, boneless 450F in oven 325F 15-18 125F Another long and narrow cut with a thin layer of protective fat on the outside, the saddle is very tender and can be roasted by searing for 30 min. and resting for another 20 min.